It also wouldn't change the page URL, making the result of that click non bookmark able or it would mess with the fragment again, sooner or later creating URLs that look like

/help/thing#!/something/otherthing

Which is equally confusing and more error prone for the developers as /help/thing loads code specific to that view and then the /something/otherthing stuff is loaded too. Not insolvable and preventable by proper encapsulation, but stuff leaks, so mistakes will happen.